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  <title>返回当前 PHP 版本所支持的图像类型</title>
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  <div id="layout-content"><div id="function.imagetypes" class="refentry">
   <div class="refnamediv">
    <h1 class="refname">imagetypes</h1>
    <p class="verinfo">(PHP 4 &gt;= 4.0.2, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagetypes</span> &mdash; <span class="dc-title">返回当前 PHP 版本所支持的图像类型</span></p>

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   <div class="refsect1 unknown-seealsp" id="refsect1-function.imagetypes-unknown-seealsp">
    <h3 class="title">说明</h3>
    <div class="methodsynopsis dc-description">
     <span class="methodname"><strong>imagetypes</strong></span>
      ( <span class="methodparam">void</span>
     ) : <span class="type">int</span></div>

    <p class="para rdfs-comment">
     本函数以比特字段方式返回与当前 PHP 版本关联的 GD
     库所支持的图像格式。将返回以下结果，<strong><code>IMG_GIF</code></strong>
     | <strong><code>IMG_JPG</code></strong>
     | <strong><code>IMG_PNG</code></strong>
     | <strong><code>IMG_WBMP</code></strong>| <strong><code>IMG_XPM</code></strong>。
     例如要检查是否支持 PNG，这样做：
     <div class="example" id="example-3744">
      <p><strong>Example #1 <span class="function"><strong>imagetypes()</strong></span> 例子</strong></p>
      <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">if&nbsp;(</span><span style="color: #0000BB">imagetypes</span><span style="color: #007700">()&nbsp;&amp;&nbsp;</span><span style="color: #0000BB">IMG_PNG</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"PNG&nbsp;Support&nbsp;is&nbsp;enabled"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
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